Novel rechargeable jig saw

Abstract

The utility model discloses a novel rechargeable jig saw, and belongs to the field of jig saws. The device mainly comprises a machine shell, a rolling sleeve assembly and a driving assembly, a supporting box base is installed in the machine shell, the rolling sleeve assembly comprises a first rotating shaft installed on the supporting box base through a bearing, a large gear is installed on the first rotating shaft, and an eccentric shaft is installed at the eccentric position of the large gear; a front support and a rear support are symmetrically installed in the machine shell, a reciprocating rod composed of main rod bodies at the two ends and a middle connector is arranged between the front support and the rear support, the main rod bodies at the two ends penetrate through the front support and the rear support respectively, the connector is located between the two main rod bodies and provided with a kidney-shaped groove, and one end of the reciprocating rod is detachably connected with a saw blade. The eccentric shaft is sleeved with a rolling sleeve part which is matched with the kidney-shaped groove and reduces the friction coefficient between the rolling sleeve part and the kidney-shaped groove. According to the novel rechargeable jig saw, the rolling sleeve part of the eccentric shaft is matched with the waist groove of the reciprocating rod, sliding friction is replaced with rolling friction, energy consumption and abrasion are effectively reduced, and transmission stability and equipment durability are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of jigsaw technology, and in particular to a novel rechargeable jigsaw. Background Technology

[0002] In modern wood processing, metal cutting and other fields, rechargeable jigsaws have been widely used due to their portability and flexible curve cutting capabilities. Their working principle is mainly based on the motor outputting power, which is reduced by gears, and then the eccentric shaft and roller sleeve on the large gear drive the reciprocating rod and saw blade to reciprocate, thereby realizing the sawing operation of materials.

[0003] However, during prolonged continuous operation, the eccentric shaft and rolling sleeve on the large gear are prone to wear due to high-frequency contact and relative sliding. As wear intensifies, the original fit clearance between them is disrupted, reducing the stability of the saw blade's trajectory during reciprocating motion. This leads to decreased sawing accuracy, resulting in a rough and uneven surface on the cut workpiece, and potentially even dimensional deviations, affecting processing quality. Furthermore, the poor fit of components caused by wear generates noise and vibration during equipment operation, disrupting the working environment and impacting work efficiency. Therefore, a new type of rechargeable jigsaw needs to be designed.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This utility model provides a novel rechargeable jigsaw to solve the problem that when a jigsaw works continuously for a long time, the high-frequency contact between the large gear eccentric shaft and the rolling sleeve causes wear, damages the fit clearance, affects the cutting quality, causes noise and vibration, and reduces work efficiency.

[0006] This utility model embodiment adopts the following technical solution: a novel rechargeable jigsaw. It includes a housing, a roller assembly, and a drive assembly. A support base is fixedly installed inside the housing. The roller assembly includes a rotating shaft mounted on the support base with bearings. A large gear is installed at one end of the rotating shaft, and an eccentric shaft is installed eccentrically on the large gear. A front support and a rear support are symmetrically installed inside the housing. A reciprocating rod, consisting of two main shafts and a connecting head in the middle, is arranged between them. The two main shafts pass through the front support and the rear support respectively. The connecting head is located between the two main shafts and has a groove. A saw blade is detachably connected to one end of the reciprocating rod. A roller portion is fitted onto the eccentric shaft, which is adapted to the groove and reduces the coefficient of friction with the groove.

[0007] Furthermore, the rolling sleeve includes a needle roller bearing, a steel sleeve, a washer, and a retaining ring sequentially mounted on the eccentric shaft.

[0008] Furthermore, both ends of the rear support are equipped with shock-absorbing washers, which are annular in structure and fit tightly between the rear support and the inner wall of the housing.

[0009] Furthermore, one end of the reciprocating rod is provided with a clamping part, which includes a clamping head fixedly connected to the reciprocating rod. A screw hole is opened on one side of the clamping head, and a side clamping screw is screwed into the screw hole. The end of the screw presses against the clamping plate and the saw blade located in the groove. By tightening the screw, the clamping plate clamps the saw blade in the groove.

[0010] Furthermore, the drive assembly includes a motor installed inside the housing, with its output end fixedly connected to a second rotating shaft. One end of the second rotating shaft passes through the support housing and extends outward. A small gear is assembled at the end of the second rotating shaft, and the small gear meshes with the large gear for transmission.

[0011] Furthermore, a fan blade is fixedly installed on the second rotating shaft, which rotates synchronously with the second rotating shaft to form a centrifugal fan structure. The casing has heat dissipation grooves corresponding to the exhaust path of the fan blade, and the two are designed to be fluidly connected.

[0012] Furthermore, the housing has a grip portion, and the area of ​​the grip portion that directly contacts the hand is provided with an anti-slip surface.

[0013] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0014] A novel rechargeable jigsaw utilizes a rolling sleeve fitted to the eccentric shaft and adapted to the groove of the reciprocating rod. This replaces traditional sliding friction with rolling friction, reducing energy loss during transmission, minimizing component wear, and improving transmission stability and durability. This addresses the problems of traditional jigsaws where sliding friction not only consumes significant energy but also generates heat, leading to a decline in component material properties. The rolling characteristics of the sleeve effectively avoid these issues, resulting in more efficient power transmission. Furthermore, the tight fit between the sleeve and the groove reduces vibration and impact during high-speed rotation of the eccentric shaft, extending the service life of all components. Symmetrical front and rear supports further enhance the reciprocating rod's stability, effectively limiting radial sway and ensuring precise saw blade trajectory for smoother and more accurate cutting. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0016] In the attached diagram:

[0017] Figure 1 This is an overall schematic diagram of a novel rechargeable jigsaw according to this application;

[0018] Figure 2 for Figure 1 A sectional view;

[0019] Figure 3 for Figure 2 Exploded view of the local structure in the image;

[0020] Figure 4 for Figure 3 Enlarged view of point A;

[0021] Figure label:

[0022] 1. Jigsaw assembly; 11. Housing; 12. Grip; 13. Anti-slip part; 14. Support box; 15. Heat dissipation groove; 2. Roller assembly; 21. Rotating shaft one; 22. Large gear; 23. Eccentric shaft; 24. Front support; 25. Reciprocating rod; 251. Main shaft; 252. Connector; 253. Waist groove; 26. Rear support; 261. Vibration damping washer; 27. Needle roller bearing; 28. Steel sleeve; 29. ​​Snap ring; 210. Washer; 211. Saw blade; 212. Clamping part; 3. Drive assembly; 31. Motor; 32. Fan blade; 33. Pinion. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0025] Reference Figures 1 to 4 As shown, this utility model embodiment provides a novel rechargeable jigsaw, including a jigsaw assembly 1, a rolling sleeve assembly 2, and a drive assembly 3;

[0026] The jigsaw assembly 1 includes a housing 11, in which a support base 14 is fixedly installed to provide a stable bearing platform for the core transmission components. The roller assembly 2 includes a bearing mounted on the support base 14, with a large gear 22 fixedly installed at one end of the shaft 21. An eccentric shaft 23 is fixedly installed on the large gear 22 at an eccentric position. The large gear 22 is adapted to rotate at high speed under the drive of the drive component, driving the eccentric shaft 23 to rotate synchronously eccentrically.

[0027] Furthermore, a rolling sleeve is fitted onto the eccentric shaft 23. The rolling sleeve includes a needle roller bearing 27, a steel sleeve 28, a washer 210, and a retaining ring 29, which are sequentially fitted onto the eccentric shaft 23. The needle roller bearing 27 effectively reduces the coefficient of friction between the eccentric shaft 23 and the rotating parts through the densely arranged needle rollers. The steel sleeve 28 provides high-strength support and protection to prevent the bearing from directly wearing the eccentric shaft 23. The washer 210 and the retaining ring 29 cooperate with each other to ensure the axial positioning stability of the rolling sleeve and prevent the parts from moving under high-frequency vibration.

[0028] Meanwhile, a front support 24 and a rear support 26 are symmetrically fixedly installed inside the housing 11, forming a guide space with a specific spacing between them. Within this space, a reciprocating rod 25, consisting of two main rod bodies 251 at both ends and a connecting head 252 in the middle, is installed.

[0029] The main body 251 at both ends passes through the front support 24 and the rear support 26 respectively. At the same time, a through groove (not shown in the figure) adapted to one end of the main body 251 is opened on both the front support 24 and the rear support 26. The through groove ensures that the body can slide smoothly back and forth in it, while restricting its radial movement to ensure movement stability. Meanwhile, the connector 252 is located between the two main body 251 and has a waist groove 253.

[0030] The roller sleeve on the eccentric shaft 23 is precisely fitted into the waist groove 253. Meanwhile, a saw blade 211 is detachably connected to one end of the reciprocating rod 25. When the large gear 22 drives the eccentric shaft 23 to rotate, the roller sleeve slides within the waist groove 253, converting the circular motion of the eccentric shaft 23 into the linear reciprocating motion of the reciprocating rod 25. Since the saw blade 211 is detachably connected to one end of the reciprocating rod 25, the saw blade 211 will follow the reciprocating rod 25 in a linear reciprocating motion with the same frequency and amplitude, thereby achieving the cutting operation of the material.

[0031] Specifically, both ends of the rear support 26 are equipped with shock-absorbing washers 261. These washers have an annular structure and fit tightly between the rear support 26 and the inner wall of the housing 11. The two sets of shock-absorbing washers 261 are located on the front and rear sides of the rear support 26 in contact with the housing, forming a symmetrical shock-absorbing layout. This creates a flexible buffer layer without affecting the normal sliding of the reciprocating rod 25.

[0032] When the jigsaw is running, the mechanical vibration generated by the linear motion of the reciprocating rod 25 and the gear transmission is transmitted to the housing 11 through the rear support 26. The vibration damping washer 261 is made of an elastic material (such as rubber or silicone), which utilizes its elastic deformation characteristics to convert vibration energy into its own elastic potential energy, absorbing and buffering the transmission of vibration waves. Through the flexible buffering of the washer, the rigid contact between the rear support 26 and the housing 11 is reduced, thereby reducing the transmission of vibration to the grip 12.

[0033] Specifically, one end of the reciprocating rod 25 is provided with a clamping part 212. The clamping part 212 includes a clamping head that is fixedly connected to the reciprocating rod 25. A screw hole is opened on one side of the clamping head. A side clamping screw is screwed into the screw hole. The end of the screw presses against the clamping plate and the saw blade 211 located in the groove. By tightening the screw, the clamping plate clamps the saw blade 211 in the groove.

[0034] Specifically, the drive assembly 3 includes a motor 31 installed in the housing 11, the output end of which is fixedly connected to a rotating shaft 2. One end of the rotating shaft 2 passes through the support housing 14 and extends outward. A small gear 33 is assembled at the end of the rotating shaft 2, and the small gear 33 meshes with the large gear 22 for transmission.

[0035] When the motor 31 is powered on, it drives the rotating shaft 2 to rotate at high speed, which in turn drives the pinion 33 to rotate. The pinion 33 transmits power to the large gear 22 through meshing. Due to the difference in the number of teeth between the two, the large gear 22 rotates at a lower speed and synchronously drives the eccentric shaft 23 to make a circular motion. The rolling sleeve on the eccentric shaft 23 is embedded in the waist groove 253 of the reciprocating rod 25 connector 252. As the eccentric shaft 23 rotates, the rolling sleeve slides back and forth in the waist groove 253, forcing the reciprocating rod 25 to make a linear reciprocating motion along the through groove of the front and rear supports 26. Finally, the saw blade 211 is driven by the clamping mechanism to complete the high-frequency cutting action.

[0036] Specifically, a fan blade 32 is fixedly installed on the second rotating shaft, which rotates synchronously with the second rotating shaft to form a centrifugal fan structure. A heat dissipation groove 15 is provided on the casing 11 corresponding to the exhaust path of the fan blade 32, and the two are designed to be fluidly connected, allowing the heat generated by the rotation of the fan blade 32 to be directionally discharged outside the casing 11. The heat dissipation groove 15 typically adopts a grid-like or louvered structure, ensuring smooth airflow while effectively preventing the intrusion of external foreign objects.

[0037] Specifically, the housing 11 has a grip portion 12, the shape of which is ergonomically designed to fit the curvature of the worker's hand. In the area of ​​the grip portion 12 that directly contacts the hand, an anti-slip portion 13 is provided. The anti-slip portion 13 can adopt a textured surface, a rubber coating, or granular protrusions, etc., to increase the coefficient of friction of the contact surface and improve the stability of the hand grip.

[0038] In summary: After the motor 31 of the drive assembly 3 starts, it drives the pinion 33 to rotate at high speed through the rotating shaft 2. The pinion 33 meshes with the large gear 22 to achieve speed reduction and torque increase, so that the large gear 22 drives the eccentric shaft 23 to perform circular motion at a speed suitable for cutting. The rolling sleeve on the eccentric shaft 23 cooperates with the waist groove 253 of the reciprocating rod 25 connector 252, converting the circular motion into the linear reciprocating motion of the reciprocating rod 25 along the guide grooves of the front support 24 and the rear support 26, and finally drives the saw blade 211 to complete the cutting operation through the clamping part 212.

[0039] The roller sleeve section adopts a combination of needle roller bearing 27 and steel sleeve 28 to reduce the friction coefficient between eccentric shaft 23 and rotating parts and provide high-strength support. Combined with the axial positioning design of shim 210 and snap ring 29, it effectively reduces component wear and movement under high-frequency vibration and extends the service life of the equipment. The through-slot guide structure of front support 24 and rear support 26 restricts the radial movement of reciprocating rod 25 and ensures the stability of saw blade 211 movement.

[0040] The linear motion of the reciprocating rod 25 and the mechanical vibration generated by the gear transmission are transmitted to the housing 11 through the rear support 26. The elastic deformation characteristics of the shock-absorbing washer 261 convert the vibration energy into its own elastic potential energy, absorbing and buffering the transmission of vibration waves. The gear transmission of the drive assembly 3 achieves speed reduction and torque increase, meeting the requirements of the cutting operation. For heat dissipation, the cooperation between the fan blade 32 and the heat dissipation slot 15 forms forced convection cooling, preventing the motor 31 and its components from degrading due to overheating.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A novel rechargeable jigsaw, comprising a housing (11), a rolling sleeve assembly (2), and a drive assembly (3), characterized in that: The housing (11) is equipped with a support box base (14), and the roller sleeve assembly (2) includes a first rotating shaft (21) mounted on the support box base (14) with a bearing. A large gear (22) is mounted on one end of the first rotating shaft (21), and an eccentric shaft (23) is mounted on the large gear (22) at an eccentric position. The housing (11) is symmetrically equipped with a front support (24) and a rear support (26). Between the two is a reciprocating rod (25) consisting of two main rods (251) and a connecting head (252) in the middle. The two main rods (251) pass through the front support (24) and the rear support (26) respectively. The connecting head (252) is located between the two main rods (251) and has a waist groove (253) on it. One end of the reciprocating rod (25) can be detachably connected to a saw blade (211). The eccentric shaft (23) is fitted with a rolling sleeve that is adapted to the waist groove (253) and is suitable for reducing the coefficient of friction between the eccentric shaft (253) and the waist groove (253).

2. The novel rechargeable jigsaw according to claim 1, characterized in that: The rolling sleeve includes a needle roller bearing (27), a steel sleeve (28), a washer (210), and a retaining ring (29) sequentially mounted on the eccentric shaft (23).

3. A novel rechargeable jigsaw according to claim 2, characterized in that: Both ends of the rear support (26) are equipped with shock-absorbing washers (261). The shock-absorbing washers (261) are in the form of a ring and are tightly fitted between the rear support (26) and the inner wall of the housing (11).

4. A novel rechargeable jigsaw according to claim 3, characterized in that: One end of the reciprocating rod (25) is provided with a clamping part (212). The clamping part (212) includes a clamping head that is fixedly connected to the reciprocating rod (25). A screw hole is opened on one side of the clamping head. A side clamping screw is screwed into the screw hole. The end of the screw presses against the clamping plate and the saw blade (211) located in the groove. By tightening the screw, the clamping plate clamps the saw blade (211) in the groove.

5. A novel rechargeable jigsaw according to claim 4, characterized in that: The drive assembly (3) includes a motor (31) installed in the housing (11), with its output end fixedly connected to a rotating shaft two. One end of the rotating shaft two passes through the support box base (14) and extends outward. A small gear (33) is assembled at the end of the rotating shaft two. The small gear (33) and the large gear (22) form a meshing transmission.

6. A novel rechargeable jigsaw according to claim 5, characterized in that: The fan blade (32) is fixedly installed on the rotating shaft 2, and rotates synchronously with the rotating shaft 2 to form a centrifugal fan structure. The casing (11) has a heat dissipation groove (15) corresponding to the exhaust path of the fan blade (32), and the two are designed to be fluidly connected.

7. A novel rechargeable jigsaw according to claim 5, characterized in that: The housing (11) has a grip portion (12), and the area of ​​the grip portion (12) that contacts the hand is provided with an anti-slip portion (13).

Images